You've done the right thing. I know it doesn't feel like it very much at the moment, but that's because the denial that has sustained you through these years of abuse is starting to be rubbed away. Of course you feel raw. But the long term result of this will be proper protection for you and your DS, and that is why it is the right thing.
The person who has done something to be deeply ashamed of, and to be very worried about the consequences of, is 'him'.
I can understand how it all feels too full on now, I have to say I wouldn't have expected such a lot of involvement of different bodies either seeing as you don't live with him, it must feel invasive to have to involve school and so on... But the fact is, this man raped you and has repeatedly sexually and emotionally abused you over a period of years, and you weren't able to keep him out of your life (for reasons that were none of your fault) so you need this support to do so.
The fact is that when he raped you he treated you like a piece of meat to be battered but you've soldiered on alone for so long that you've suppressed a lot of your natural reactions, and now in the light of other people's responses you're starting to see how bad what he's done to you actually is, and yes, that hurts. I'm so sorry.
There's probably a lot of hurt to come up, a lot of grieving to be done somewhere along the line, but believe me, even though it hurts now, it's infinitely better than the alternative, which would have been to carry on in this abusive situation for yet more years, to sustain more and more hurt - emotional and physical - along the way. This man was a real threat to your and your DS's safety, and he still could be, unless he is dealt with by the police and whatever other agencies need to be involved.
You have been so strong. You have done something really courageous. Well done, I'm sorry it's been so harrowing today, but you have a lot to feel proud of in yourself, and this step you have taken will set you on the way to really getting clear of this 'man', and living your life in safety. It will get better. Extra
for you sweetheart.